I think some of the problem when talking UV is there really is no standard. What's being used in LED's when they say UV isn't really UV, it's true violet or some form thereof. I've read of TV LED's ranging from 395nm to 410, 410-420, 420-whatever. But because these LED's are putting out only those wavelengths you have to have a mix of them all to really call it a FULL spectrum build. That's pricey. It's why you're not seeing it being done in commercially available products. Heck, I still haven't seen DIY builds doing all the spectrum, there's still arguments about which ones are even being used.
But with MH, just turn it on and you at least have some amounts of everything.
Even if a specific coral uses only .5% of a certain spectrum in the wild, that .5% is still going to affect it's coloration and growth to some extent if it's not provided. It may still be able to live and grow, but not as well. Until someone comes up with an LED or fixture that incorporates everything that a coral needs for a certain look an individual wants, you won't get the "pop", florescence etc. you're looking for. And it's going to take someone with the time, money and perseverance to try and try and try again to figure it out. That's how anything progresses.
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